How economics wins wars, with Duncan Weldon

Episode Summary

Executive Summary: The episode argues that war and economics are deeply intertwined: historically, war drove state-building, taxation, central banks, and bureaucracy, while in the 20th and 21st centuries economic capacity increasingly determines war outcomes. Duncan Weldon says modern industrial warfare depends on GDP, flexible production, logistics, and trade-offs between soldiers, factories, and civilian needs, making wealthy, adaptable economies far more resilient in prolonged conflict.

Main Topics: War as a driver of state and institutional development: Warfare pushed states to build taxation systems, legal frameworks, central banks, and bureaucracies to finance armies and sustain conflict. Pre-industrial war and economic development: In earlier eras, war could raise income per head by reducing labor faster than capital, but this changed once industrialized, high-explosive warfare became capital-destructive. Mercantilism and zero-sum economics: Early modern states treated trade as a rivalry for bullion and control of colonies, viewing exports as strength and imports as weakness. Total war in the 20th century: World Wars I and II made industrial capacity, food supply, and mobilization central to military success, with defense spending reaching unprecedented shares of GDP. Economic collapse and war outcomes: Russia’s collapse in World War I shows how breakdowns in food supply, exchange, and civilian morale can end a war by undermining the home front. Modern economic warfare and strategic bombing: Blockades, submarine warfare, and bombing campaigns seek to deny resources or destroy production, but modern economies adapt through substitution and stockpiles. Lessons for Ukraine, Europe, and US-China tensions: Today’s wars require rapid industrial scaling, drone adaptation, and sustained spending; richer economies can endure longer wars and recover losses more easily.

Key Arguments: Economics is highly important to war, especially in modern industrial conflict where sustaining production and logistics is decisive. Historically, war helped create states by forcing them to develop taxation, debt markets, central banks, and administrative capacity. In the pre-industrial era, war sometimes increased output per head by reducing labor more than capital, but that logic no longer applies in modern warfare. The Bank of England originated as a war-financing institution, illustrating how military needs shaped financial institutions later used for economic stability. Mercantilist thinking treated international trade as zero-sum, but this reflected policy beliefs more than sound economics. World War I and II were “total wars” where industrial output, food production, and civilian support mattered as much as battlefield tactics. Liberal capitalist democracies proved better able than autocracies and command economies to manage the trade-offs of total war. Service-sector workers, including accountants, can be strategically valuable in war because they support logistics, blockades, and labor reallocation. Strategic bombing and attacks on supply chains can damage an enemy, but modern economies are resilient webs rather than brittle chains. For prolonged conflicts, higher GDP and industrial capacity are decisive because richer states can absorb losses and replenish more effectively.

Data Points: Importance of economics for war: 7/10 - Duncan’s rating of how important economics is to war, without caveats. Defense spending in earlier large wars (Britain): 10–15% of GDP - Typical British war spending in previous large wars before the world wars. Defense spending in total wars: Over 50% of GDP in some years - Seen in the First and Second World Wars. British population reliance on imports: Most food imported - Britain in both world wars relied on global sea lanes for food supply. Russia’s prewar social structure: 85% peasant farmers - Used to explain the fragility of Russia’s wartime food and exchange system. British defense spending target: 2.3% to 2.5% of GDP - Current Western debate cited as a small step rather than a full solution. Likely Western Europe defense spending: Around 3.5% of GDP - Duncan’s estimate of where defense spending may head in Europe. Modern war emphasis: 21st-century Ukraine and drones - Used to show that modern war still requires industrial adaptation alongside new technologies.

Pivotal Quotes: "states make war and war makes states" — Duncan Weldon: Summarizing how warfare has driven the development of institutions over history. "one in every two pounds of the economy's output is going directly to war fighting" — Duncan Weldon: Describing the scale of economic mobilization in the total wars of the 20th century. "a modern economy is not a chain where if you break one link, the entire thing falls apart. It's more like an interlocked web" — Duncan Weldon: Explaining why strategic bombing and industrial disruption do not instantly cripple a modern enemy.

Implications: Listeners should see war as an economic contest of resilience, production, and mobilization. For governments, the lesson is to invest in flexible industry, logistics, and credible defense capacity before conflict begins.